Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and cut it into 1-inch bite-sized cubes.
Place the chicken cubes, broccoli florets, and sliced bell peppers into a large mixing bowl.
Drizzle the extra virgin olive oil over the mixture and sprinkle with dried rosemary, thyme, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated with the oil and herbs.
Spread the mixture in a single layer on the prepared baking sheet, ensuring nothing is overcrowded so it roasts rather than steams.
Roast in the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly browned.
Remove from the oven and let rest for 2 minutes before serving to keep the chicken juicy.